1. Department of Physics, Faculty of Science, Okayama University, 3-1-1 Tsushima-Naka, Okayama, Okayama 700
2. Photon Factory, National Laboratory for High Energy Physics, 1-1 Oho, Tsukuba, Ibaraki 305
3. Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376
4. Tokyo Gakugei University, 4-1-1 Nukui-kita, Koganei, Tokyo 184